Bivalve coquina assemblage: Anisian, Poland
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Carditida
- Myophoricardiidae
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Pseudocorbula sp.
Philippi 1898
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553 specimens | ||||||
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Bivalvia
- Pterioida
- Prospondylidea
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Enantiostreon difforme
(Schlotheim 1820)
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35 specimens | ||||||
| recombined as Terquemia difformis | |||||||
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Bivalvia
- Pectinida
- Limidae
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Plagiostoma sp.
Sowerby 1814
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3 specimens | ||||||
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Plagiostoma cf. praecursor
Quenstedt 1856
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35 specimens | ||||||
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Pseudolimea regularis
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21 specimens | ||||||
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Pseudolimea sp.
Douglas and Arkell 1932
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3 specimens | ||||||
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Bivalvia
- Ostreida
- Bakevelliidae
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Hoernesia socialis
(Schlotheim 1823)
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14 specimens | ||||||
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Rhynchonellata
- Rhynchonellida
- Austrirhynchidae
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Decurtella decurtata
(Girard 1843)
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3 specimens | ||||||
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Rhynchonellata
- Terebratulida
- Dielasmatidae
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Coenothyris vulgaris
(Schlotheim 1820)
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27 specimens | ||||||
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Rhynchonellata
- Athyridida
- Diplospirellidae
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Tetractinella trigonella
(Schlotheim 1820)
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3 specimens | ||||||
| see common names | |||||||
Geography
| Country: | Poland |
| Coordinates: | 50.0° North, 19.0° East (view map) |
| Paleocoordinates: | 18.2° North, 24.6° East |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Middle Triassic |
| Stage: | Anisian | 10 m.y. bin: | Triassic 2 |
| Key time interval: | Anisian | ||
| Age range of interval: | 247.20000 - 242.00000 m.y. ago |
Stratigraphy
| Formation: | Karchowice | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: The paleoecologic analysis is based on five sections from the Strzelc Opolskie Quarry. The five sections cover the entire span of the Terebratula Beds and the lowermost part of the Karchowice Beds. The Terebratula Beds are subdivided into three units: Lower marls, Crinoid limestones, and Coquina and wavy limestones (See description below for details) Upper Silesian Region | |||||
Lithology and environment
| Primary lithology: | lithified "limestone" |
| Includes fossils? | Y |
| Lithology description: Lower marls - Crumpled and wavy limestones dominate in this unit. Shelly fossils are practically absent. Only in one place badly preserved tiny bivalves have been observed. Crinoid Limestone - Two firmgrounds occur in the lower part of this unit. the middle and upper parts are composed of thick calcarenitic beds. Dominant skeletal components change upward from mixed skeletal debris in the lower part, through crinoid columnals in the middle part, to terebratulid shell debis in the upper part. Coquinas and wavy limestone - Four lithological types have been distinguished: a) brachiopod coqunia. Up to 30 cm thick coquina layers, separated by crumpled and wavy limestone, occur in the whole unit. b) Crumpled and wavy limestone. Limestone beds which exhibit deformational structures varying from wavy bedding and gentle undulation, to structures intricately crumpled and fragmented. Fossils uncommon but their number increase upward. c) Bivalve coquina. This lithology appears in the uppermost part if the unit as thin shell beds composed of closely packed internal molds of small articulated bivalves. d) Organodetrial limestone with foraminifers. Numerous benthic forams are the main component of this limestone. Karchowice Beds - Crinoid and micritic limestones dominate in this unit. Sponges as well as brachiopods are identified. Very numerous are columnals of crinoids and in places, shells of unidentified bivalves. Hardgrounds with a rich assemblages of trace fossiles are well developed on the micritic limestone bedding planes | |
| Environment: | marine indet. |
| Geology comments: Bivalve coquina assemblage - 9 bedding planes with 697 specimens represent this type of assemblage. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 33419 | ||
| Authorizer: | D. Bottjer | Enterer: | N. Bonuso |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2003-07-29 15:27:05 | Last modified: | 2017-07-31 18:35:36 |
| Access level: | the public | Released: | 2003-07-29 15:27:05 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 8874. | A. Kaim. 1997. Brachiopod-bivalve assemblages of the middle Triassic Terebratula Beds, Upper Siesia, Poland. Acta Palaeontologica Polonica 42(2):333-359 [D. Bottjer/N. Bonuso/M. Uhen] |